Home / 2,275.80-3,139.78-1,391.28

Finding the Fourth Proportional to 2,275.80, 3,139.78 and 1,391.28

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Solution

The fourth proportional to 2,275.80, 3,139.78 and 1,391.28 is: 1,919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.80 : 3,139.78 = 1,391.28 : x
  2. Step 2: Convert to fraction form
    2,275.80/3,139.78 = 1,391.28/x
  3. Step 3: Cross multiply
    2,275.80x = 3,139.78 × 1,391.28
  4. Step 4: Simplify right side
    2,275.80x = 4,368,313.12
  5. Step 5: Solve for x
    x = 4,368,313.12/2,275.80
  6. Step 6: Final answer
    x = 1,919.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.